About the Borg, TNG had the Borg few times and I think that was enough. Somehow the Borg feels like an enemy that can't be used very often. If you beat an enemy on every season few times, how scary can that enemy be after that? Laying the foundation for Sisko was enough of Borg for DS9.
Voyager on the other hand had too much Borg stuff and although introduced in 'First Contact' the Borg Queen ruined the whole Borg concept for me, at least for everything that happened after that movie. (I avoid First Contact' these days)
As a TNG fanatic, I think having Worf visit DS9 for few episodes would have been fine but taking him as a part of the DS9 crew, I'm not a fan of that decision. Worf = TNG character for me, not so much DS9.
6 seasons of Jadzia and 1 with Ezri.. not a fan of that decision either.
Voyager used them way too much. Once, twice at most would have been O.K.
Yes. The Kira role was supposed to be her, and she refused.
Later they wanted her on Voyager, and arguably created the whole maquis thing just for an excuse to include her. She refused again, and her character became Torres.
Voyager was traveling through Borg space, and later very close to Borg space, so it would have been stupid to have less Borg. And frankly, I despised the Kazon to no end, and even more so when it was revealed that they were an inferior species that just stole their technology from others. So maybe the Borg didn't bother me just because they displaced the Kazon.
I agree with everyone that said the Borg would have been out of place on DS9. The station would have been no match, for one thing.
I would have liked maybe 4 less Borg episodes on Voyager... I didn't care for the plot of "Unimatrix Zero", although the acting, writing and effects were well done.
Worf was a perfect addition to DS9. The ensemble needed him. I don't know if they ever explained why the character left the Enterprise, but IMO, the show needed the character. O'Brien, Bashir, Dax and even Kira could not carry complex story lines. Don't beat me up for this... they supported complex story lines, but how many Trill stories could you have, how many angry Kira Bajoran occupation stories could you have... But there was always a way to expand the Klingon mythology, or Worf mythology, and fold it in or have the stories stand on their own. And Worf was just interesting, where O'Brien and Bashir.. not so much.
I wish Odo wasn't such a condescending, disagreeable character. I think he looked at solids with barely concealed contempt even before the war.
I didn't find the Odo/Kira romance believable at all.
I wish they could have been a little nicer to Quark. Sometimes the shit he has to take from Odo and Kira is a little sickening. Doesn't seem to be a lot of tolerance for the cultural differences with the Ferengi, by anyone.
I wish Kai Winn didn't die at the end, and was instead was more completely redeemed. I didn't care for Dukat's entire involvement with the end story.
They should have had a less ambiguous ending!!!